drivers/scsi/scsi_transport_sas.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2005-2006 Dell Inc.
   4  *
   5  * Serial Attached SCSI (SAS) transport class.
   6  *
   7  * The SAS transport class contains common code to deal with SAS HBAs,
   8  * an aproximated representation of SAS topologies in the driver model,
   9  * and various sysfs attributes to expose these topologies and management
  10  * interfaces to userspace.
  11  *
  12  * In addition to the basic SCSI core objects this transport class
  13  * introduces two additional intermediate objects:  The SAS PHY
  14  * as represented by struct sas_phy defines an "outgoing" PHY on
  15  * a SAS HBA or Expander, and the SAS remote PHY represented by
  16  * struct sas_rphy defines an "incoming" PHY on a SAS Expander or
  17  * end device.  Note that this is purely a software concept, the
  18  * underlying hardware for a PHY and a remote PHY is the exactly
  19  * the same.
  20  *
  21  * There is no concept of a SAS port in this code, users can see
  22  * what PHYs form a wide port based on the port_identifier attribute,
  23  * which is the same for all PHYs in a port.
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/module.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/err.h>
  30 #include <linux/slab.h>
  31 #include <linux/string.h>
  32 #include <linux/blkdev.h>
  33 #include <linux/bsg.h>
  34
  35 #include <scsi/scsi.h>
  36 #include <scsi/scsi_cmnd.h>
  37 #include <scsi/scsi_device.h>
  38 #include <scsi/scsi_host.h>
  39 #include <scsi/scsi_transport.h>
  40 #include <scsi/scsi_transport_sas.h>
  41
  42 #include "scsi_sas_internal.h"
  43 struct sas_host_attrs {
  44         struct list_head rphy_list;
  45         struct mutex lock;
  46         struct request_queue *q;
  47         u32 next_target_id;
  48         u32 next_expander_id;
  49         int next_port_id;
  50 };
  51 #define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
  52
  53
  54 /*
  55  * Hack to allow attributes of the same name in different objects.
  56  */
  57 #define SAS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
  58         struct device_attribute dev_attr_##_prefix##_##_name = \
  59         __ATTR(_name,_mode,_show,_store)
  60
  61
  62 /*
  63  * Pretty printing helpers
  64  */
  65
  66 #define sas_bitfield_name_match(title, table)                   \
  67 static ssize_t                                                  \
  68 get_sas_##title##_names(u32 table_key, char *buf)               \
  69 {                                                               \
  70         char *prefix = "";                                      \
  71         ssize_t len = 0;                                        \
  72         int i;                                                  \
  73                                                                 \
  74         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
  75                 if (table[i].value & table_key) {               \
  76                         len += sprintf(buf + len, "%s%s",       \
  77                                 prefix, table[i].name);         \
  78                         prefix = ", ";                          \
  79                 }                                               \
  80         }                                                       \
  81         len += sprintf(buf + len, "\n");                        \
  82         return len;                                             \
  83 }
  84
  85 #define sas_bitfield_name_set(title, table)                     \
  86 static ssize_t                                                  \
  87 set_sas_##title##_names(u32 *table_key, const char *buf)        \
  88 {                                                               \
  89         ssize_t len = 0;                                        \
  90         int i;                                                  \
  91                                                                 \
  92         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
  93                 len = strlen(table[i].name);                    \
  94                 if (strncmp(buf, table[i].name, len) == 0 &&    \
  95                     (buf[len] == '\n' || buf[len] == '\0')) {   \
  96                         *table_key = table[i].value;            \
  97                         return 0;                               \
  98                 }                                               \
  99         }                                                       \
 100         return -EINVAL;                                         \
 101 }
 102
 103 #define sas_bitfield_name_search(title, table)                  \
 104 static ssize_t                                                  \
 105 get_sas_##title##_names(u32 table_key, char *buf)               \
 106 {                                                               \
 107         ssize_t len = 0;                                        \
 108         int i;                                                  \
 109                                                                 \
 110         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 111                 if (table[i].value == table_key) {              \
 112                         len += sprintf(buf + len, "%s",         \
 113                                 table[i].name);                 \
 114                         break;                                  \
 115                 }                                               \
 116         }                                                       \
 117         len += sprintf(buf + len, "\n");                        \
 118         return len;                                             \
 119 }
 120
 121 static struct {
 122         u32             value;
 123         char            *name;
 124 } sas_device_type_names[] = {
 125         { SAS_PHY_UNUSED,               "unused" },
 126         { SAS_END_DEVICE,               "end device" },
 127         { SAS_EDGE_EXPANDER_DEVICE,     "edge expander" },
 128         { SAS_FANOUT_EXPANDER_DEVICE,   "fanout expander" },
 129 };
 130 sas_bitfield_name_search(device_type, sas_device_type_names)
 131
 132
 133 static struct {
 134         u32             value;
 135         char            *name;
 136 } sas_protocol_names[] = {
 137         { SAS_PROTOCOL_SATA,            "sata" },
 138         { SAS_PROTOCOL_SMP,             "smp" },
 139         { SAS_PROTOCOL_STP,             "stp" },
 140         { SAS_PROTOCOL_SSP,             "ssp" },
 141 };
 142 sas_bitfield_name_match(protocol, sas_protocol_names)
 143
 144 static struct {
 145         u32             value;
 146         char            *name;
 147 } sas_linkspeed_names[] = {
 148         { SAS_LINK_RATE_UNKNOWN,        "Unknown" },
 149         { SAS_PHY_DISABLED,             "Phy disabled" },
 150         { SAS_LINK_RATE_FAILED,         "Link Rate failed" },
 151         { SAS_SATA_SPINUP_HOLD,         "Spin-up hold" },
 152         { SAS_LINK_RATE_1_5_GBPS,       "1.5 Gbit" },
 153         { SAS_LINK_RATE_3_0_GBPS,       "3.0 Gbit" },
 154         { SAS_LINK_RATE_6_0_GBPS,       "6.0 Gbit" },
 155         { SAS_LINK_RATE_12_0_GBPS,      "12.0 Gbit" },
 156         { SAS_LINK_RATE_22_5_GBPS,      "22.5 Gbit" },
 157 };
 158 sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
 159 sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
 160
 161 static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
 162 {
 163         struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
 164         struct sas_end_device *rdev;
 165
 166         BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
 167
 168         rdev = rphy_to_end_device(rphy);
 169         return rdev;
 170 }
 171
 172 static int sas_smp_dispatch(struct bsg_job *job)
 173 {
 174         struct Scsi_Host *shost = dev_to_shost(job->dev);
 175         struct sas_rphy *rphy = NULL;
 176
 177         if (!scsi_is_host_device(job->dev))
 178                 rphy = dev_to_rphy(job->dev);
 179
 180         if (!job->reply_payload.payload_len) {
 181                 dev_warn(job->dev, "space for a smp response is missing\n");
 182                 bsg_job_done(job, -EINVAL, 0);
 183                 return 0;
 184         }
 185
 186         to_sas_internal(shost->transportt)->f->smp_handler(job, shost, rphy);
 187         return 0;
 188 }
 189
 190 static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
 191 {
 192         struct request_queue *q;
 193
 194         if (!to_sas_internal(shost->transportt)->f->smp_handler) {
 195                 printk("%s can't handle SMP requests\n", shost->hostt->name);
 196                 return 0;
 197         }
 198
 199         if (rphy) {
 200                 q = bsg_setup_queue(&rphy->dev, dev_name(&rphy->dev),
 201                                 sas_smp_dispatch, NULL, 0);
 202                 if (IS_ERR(q))
 203                         return PTR_ERR(q);
 204                 rphy->q = q;
 205         } else {
 206                 char name[20];
 207
 208                 snprintf(name, sizeof(name), "sas_host%d", shost->host_no);
 209                 q = bsg_setup_queue(&shost->shost_gendev, name,
 210                                 sas_smp_dispatch, NULL, 0);
 211                 if (IS_ERR(q))
 212                         return PTR_ERR(q);
 213                 to_sas_host_attrs(shost)->q = q;
 214         }
 215
 216         return 0;
 217 }
 218
 219 /*
 220  * SAS host attributes
 221  */
 222
 223 static int sas_host_setup(struct transport_container *tc, struct device *dev,
 224                           struct device *cdev)
 225 {
 226         struct Scsi_Host *shost = dev_to_shost(dev);
 227         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 228         struct device *dma_dev = shost->dma_dev;
 229
 230         INIT_LIST_HEAD(&sas_host->rphy_list);
 231         mutex_init(&sas_host->lock);
 232         sas_host->next_target_id = 0;
 233         sas_host->next_expander_id = 0;
 234         sas_host->next_port_id = 0;
 235
 236         if (sas_bsg_initialize(shost, NULL))
 237                 dev_printk(KERN_ERR, dev, "fail to a bsg device %d\n",
 238                            shost->host_no);
 239
 240         if (dma_dev->dma_mask) {
 241                 shost->opt_sectors = min_t(unsigned int, shost->max_sectors,
 242                                 dma_opt_mapping_size(dma_dev) >> SECTOR_SHIFT);
 243         }
 244
 245         return 0;
 246 }
 247
 248 static int sas_host_remove(struct transport_container *tc, struct device *dev,
 249                            struct device *cdev)
 250 {
 251         struct Scsi_Host *shost = dev_to_shost(dev);
 252         struct request_queue *q = to_sas_host_attrs(shost)->q;
 253
 254         bsg_remove_queue(q);
 255         return 0;
 256 }
 257
 258 static DECLARE_TRANSPORT_CLASS(sas_host_class,
 259                 "sas_host", sas_host_setup, sas_host_remove, NULL);
 260
 261 static int sas_host_match(struct attribute_container *cont,
 262                             struct device *dev)
 263 {
 264         struct Scsi_Host *shost;
 265         struct sas_internal *i;
 266
 267         if (!scsi_is_host_device(dev))
 268                 return 0;
 269         shost = dev_to_shost(dev);
 270
 271         if (!shost->transportt)
 272                 return 0;
 273         if (shost->transportt->host_attrs.ac.class !=
 274                         &sas_host_class.class)
 275                 return 0;
 276
 277         i = to_sas_internal(shost->transportt);
 278         return &i->t.host_attrs.ac == cont;
 279 }
 280
 281 static int do_sas_phy_delete(struct device *dev, void *data)
 282 {
 283         int pass = (int)(unsigned long)data;
 284
 285         if (pass == 0 && scsi_is_sas_port(dev))
 286                 sas_port_delete(dev_to_sas_port(dev));
 287         else if (pass == 1 && scsi_is_sas_phy(dev))
 288                 sas_phy_delete(dev_to_phy(dev));
 289         return 0;
 290 }
 291
 292 /**
 293  * sas_remove_children  -  tear down a devices SAS data structures
 294  * @dev:        device belonging to the sas object
 295  *
 296  * Removes all SAS PHYs and remote PHYs for a given object
 297  */
 298 void sas_remove_children(struct device *dev)
 299 {
 300         device_for_each_child(dev, (void *)0, do_sas_phy_delete);
 301         device_for_each_child(dev, (void *)1, do_sas_phy_delete);
 302 }
 303 EXPORT_SYMBOL(sas_remove_children);
 304
 305 /**
 306  * sas_remove_host  -  tear down a Scsi_Host's SAS data structures
 307  * @shost:      Scsi Host that is torn down
 308  *
 309  * Removes all SAS PHYs and remote PHYs for a given Scsi_Host and remove the
 310  * Scsi_Host as well.
 311  *
 312  * Note: Do not call scsi_remove_host() on the Scsi_Host any more, as it is
 313  * already removed.
 314  */
 315 void sas_remove_host(struct Scsi_Host *shost)
 316 {
 317         sas_remove_children(&shost->shost_gendev);
 318         scsi_remove_host(shost);
 319 }
 320 EXPORT_SYMBOL(sas_remove_host);
 321
 322 /**
 323  * sas_get_address - return the SAS address of the device
 324  * @sdev: scsi device
 325  *
 326  * Returns the SAS address of the scsi device
 327  */
 328 u64 sas_get_address(struct scsi_device *sdev)
 329 {
 330         struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 331
 332         return rdev->rphy.identify.sas_address;
 333 }
 334 EXPORT_SYMBOL(sas_get_address);
 335
 336 /**
 337  * sas_tlr_supported - checking TLR bit in vpd 0x90
 338  * @sdev: scsi device struct
 339  *
 340  * Check Transport Layer Retries are supported or not.
 341  * If vpd page 0x90 is present, TRL is supported.
 342  *
 343  */
 344 unsigned int
 345 sas_tlr_supported(struct scsi_device *sdev)
 346 {
 347         const int vpd_len = 32;
 348         struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 349         char *buffer = kzalloc(vpd_len, GFP_KERNEL);
 350         int ret = 0;
 351
 352         if (!buffer)
 353                 goto out;
 354
 355         if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
 356                 goto out;
 357
 358         /*
 359          * Magic numbers: the VPD Protocol page (0x90)
 360          * has a 4 byte header and then one entry per device port
 361          * the TLR bit is at offset 8 on each port entry
 362          * if we take the first port, that's at total offset 12
 363          */
 364         ret = buffer[12] & 0x01;
 365
 366  out:
 367         kfree(buffer);
 368         rdev->tlr_supported = ret;
 369         return ret;
 370
 371 }
 372 EXPORT_SYMBOL_GPL(sas_tlr_supported);
 373
 374 /**
 375  * sas_disable_tlr - setting TLR flags
 376  * @sdev: scsi device struct
 377  *
 378  * Seting tlr_enabled flag to 0.
 379  *
 380  */
 381 void
 382 sas_disable_tlr(struct scsi_device *sdev)
 383 {
 384         struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 385
 386         rdev->tlr_enabled = 0;
 387 }
 388 EXPORT_SYMBOL_GPL(sas_disable_tlr);
 389
 390 /**
 391  * sas_enable_tlr - setting TLR flags
 392  * @sdev: scsi device struct
 393  *
 394  * Seting tlr_enabled flag 1.
 395  *
 396  */
 397 void sas_enable_tlr(struct scsi_device *sdev)
 398 {
 399         unsigned int tlr_supported = 0;
 400         tlr_supported  = sas_tlr_supported(sdev);
 401
 402         if (tlr_supported) {
 403                 struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 404
 405                 rdev->tlr_enabled = 1;
 406         }
 407
 408         return;
 409 }
 410 EXPORT_SYMBOL_GPL(sas_enable_tlr);
 411
 412 unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
 413 {
 414         struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 415         return rdev->tlr_enabled;
 416 }
 417 EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
 418
 419 /*
 420  * SAS Phy attributes
 421  */
 422
 423 #define sas_phy_show_simple(field, name, format_string, cast)           \
 424 static ssize_t                                                          \
 425 show_sas_phy_##name(struct device *dev,                                 \
 426                     struct device_attribute *attr, char *buf)           \
 427 {                                                                       \
 428         struct sas_phy *phy = transport_class_to_phy(dev);              \
 429                                                                         \
 430         return snprintf(buf, 20, format_string, cast phy->field);       \
 431 }
 432
 433 #define sas_phy_simple_attr(field, name, format_string, type)           \
 434         sas_phy_show_simple(field, name, format_string, (type)) \
 435 static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 436
 437 #define sas_phy_show_protocol(field, name)                              \
 438 static ssize_t                                                          \
 439 show_sas_phy_##name(struct device *dev,                                 \
 440                     struct device_attribute *attr, char *buf)           \
 441 {                                                                       \
 442         struct sas_phy *phy = transport_class_to_phy(dev);              \
 443                                                                         \
 444         if (!phy->field)                                                \
 445                 return snprintf(buf, 20, "none\n");                     \
 446         return get_sas_protocol_names(phy->field, buf);         \
 447 }
 448
 449 #define sas_phy_protocol_attr(field, name)                              \
 450         sas_phy_show_protocol(field, name)                              \
 451 static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
 452
 453 #define sas_phy_show_linkspeed(field)                                   \
 454 static ssize_t                                                          \
 455 show_sas_phy_##field(struct device *dev,                                \
 456                      struct device_attribute *attr, char *buf)          \
 457 {                                                                       \
 458         struct sas_phy *phy = transport_class_to_phy(dev);              \
 459                                                                         \
 460         return get_sas_linkspeed_names(phy->field, buf);                \
 461 }
 462
 463 /* Fudge to tell if we're minimum or maximum */
 464 #define sas_phy_store_linkspeed(field)                                  \
 465 static ssize_t                                                          \
 466 store_sas_phy_##field(struct device *dev,                               \
 467                       struct device_attribute *attr,                    \
 468                       const char *buf,  size_t count)                   \
 469 {                                                                       \
 470         struct sas_phy *phy = transport_class_to_phy(dev);              \
 471         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);        \
 472         struct sas_internal *i = to_sas_internal(shost->transportt);    \
 473         u32 value;                                                      \
 474         struct sas_phy_linkrates rates = {0};                           \
 475         int error;                                                      \
 476                                                                         \
 477         error = set_sas_linkspeed_names(&value, buf);                   \
 478         if (error)                                                      \
 479                 return error;                                           \
 480         rates.field = value;                                            \
 481         error = i->f->set_phy_speed(phy, &rates);                       \
 482                                                                         \
 483         return error ? error : count;                                   \
 484 }
 485
 486 #define sas_phy_linkspeed_rw_attr(field)                                \
 487         sas_phy_show_linkspeed(field)                                   \
 488         sas_phy_store_linkspeed(field)                                  \
 489 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field,                \
 490         store_sas_phy_##field)
 491
 492 #define sas_phy_linkspeed_attr(field)                                   \
 493         sas_phy_show_linkspeed(field)                                   \
 494 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 495
 496
 497 #define sas_phy_show_linkerror(field)                                   \
 498 static ssize_t                                                          \
 499 show_sas_phy_##field(struct device *dev,                                \
 500                      struct device_attribute *attr, char *buf)          \
 501 {                                                                       \
 502         struct sas_phy *phy = transport_class_to_phy(dev);              \
 503         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);        \
 504         struct sas_internal *i = to_sas_internal(shost->transportt);    \
 505         int error;                                                      \
 506                                                                         \
 507         error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0;   \
 508         if (error)                                                      \
 509                 return error;                                           \
 510         return snprintf(buf, 20, "%u\n", phy->field);                   \
 511 }
 512
 513 #define sas_phy_linkerror_attr(field)                                   \
 514         sas_phy_show_linkerror(field)                                   \
 515 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
 516
 517
 518 static ssize_t
 519 show_sas_device_type(struct device *dev,
 520                      struct device_attribute *attr, char *buf)
 521 {
 522         struct sas_phy *phy = transport_class_to_phy(dev);
 523
 524         if (!phy->identify.device_type)
 525                 return snprintf(buf, 20, "none\n");
 526         return get_sas_device_type_names(phy->identify.device_type, buf);
 527 }
 528 static DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
 529
 530 static ssize_t do_sas_phy_enable(struct device *dev,
 531                 size_t count, int enable)
 532 {
 533         struct sas_phy *phy = transport_class_to_phy(dev);
 534         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 535         struct sas_internal *i = to_sas_internal(shost->transportt);
 536         int error;
 537
 538         error = i->f->phy_enable(phy, enable);
 539         if (error)
 540                 return error;
 541         phy->enabled = enable;
 542         return count;
 543 };
 544
 545 static ssize_t
 546 store_sas_phy_enable(struct device *dev, struct device_attribute *attr,
 547                      const char *buf, size_t count)
 548 {
 549         if (count < 1)
 550                 return -EINVAL;
 551
 552         switch (buf[0]) {
 553         case '0':
 554                 do_sas_phy_enable(dev, count, 0);
 555                 break;
 556         case '1':
 557                 do_sas_phy_enable(dev, count, 1);
 558                 break;
 559         default:
 560                 return -EINVAL;
 561         }
 562
 563         return count;
 564 }
 565
 566 static ssize_t
 567 show_sas_phy_enable(struct device *dev, struct device_attribute *attr,
 568                     char *buf)
 569 {
 570         struct sas_phy *phy = transport_class_to_phy(dev);
 571
 572         return snprintf(buf, 20, "%d\n", phy->enabled);
 573 }
 574
 575 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
 576                          store_sas_phy_enable);
 577
 578 static ssize_t
 579 do_sas_phy_reset(struct device *dev, size_t count, int hard_reset)
 580 {
 581         struct sas_phy *phy = transport_class_to_phy(dev);
 582         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 583         struct sas_internal *i = to_sas_internal(shost->transportt);
 584         int error;
 585
 586         error = i->f->phy_reset(phy, hard_reset);
 587         if (error)
 588                 return error;
 589         phy->enabled = 1;
 590         return count;
 591 };
 592
 593 static ssize_t
 594 store_sas_link_reset(struct device *dev, struct device_attribute *attr,
 595                      const char *buf, size_t count)
 596 {
 597         return do_sas_phy_reset(dev, count, 0);
 598 }
 599 static DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
 600
 601 static ssize_t
 602 store_sas_hard_reset(struct device *dev, struct device_attribute *attr,
 603                      const char *buf, size_t count)
 604 {
 605         return do_sas_phy_reset(dev, count, 1);
 606 }
 607 static DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
 608
 609 sas_phy_protocol_attr(identify.initiator_port_protocols,
 610                 initiator_port_protocols);
 611 sas_phy_protocol_attr(identify.target_port_protocols,
 612                 target_port_protocols);
 613 sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
 614                 unsigned long long);
 615 sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 616 sas_phy_linkspeed_attr(negotiated_linkrate);
 617 sas_phy_linkspeed_attr(minimum_linkrate_hw);
 618 sas_phy_linkspeed_rw_attr(minimum_linkrate);
 619 sas_phy_linkspeed_attr(maximum_linkrate_hw);
 620 sas_phy_linkspeed_rw_attr(maximum_linkrate);
 621 sas_phy_linkerror_attr(invalid_dword_count);
 622 sas_phy_linkerror_attr(running_disparity_error_count);
 623 sas_phy_linkerror_attr(loss_of_dword_sync_count);
 624 sas_phy_linkerror_attr(phy_reset_problem_count);
 625
 626 static int sas_phy_setup(struct transport_container *tc, struct device *dev,
 627                          struct device *cdev)
 628 {
 629         struct sas_phy *phy = dev_to_phy(dev);
 630         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 631         struct sas_internal *i = to_sas_internal(shost->transportt);
 632
 633         if (i->f->phy_setup)
 634                 i->f->phy_setup(phy);
 635
 636         return 0;
 637 }
 638
 639 static DECLARE_TRANSPORT_CLASS(sas_phy_class,
 640                 "sas_phy", sas_phy_setup, NULL, NULL);
 641
 642 static int sas_phy_match(struct attribute_container *cont, struct device *dev)
 643 {
 644         struct Scsi_Host *shost;
 645         struct sas_internal *i;
 646
 647         if (!scsi_is_sas_phy(dev))
 648                 return 0;
 649         shost = dev_to_shost(dev->parent);
 650
 651         if (!shost->transportt)
 652                 return 0;
 653         if (shost->transportt->host_attrs.ac.class !=
 654                         &sas_host_class.class)
 655                 return 0;
 656
 657         i = to_sas_internal(shost->transportt);
 658         return &i->phy_attr_cont.ac == cont;
 659 }
 660
 661 static void sas_phy_release(struct device *dev)
 662 {
 663         struct sas_phy *phy = dev_to_phy(dev);
 664         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
 665         struct sas_internal *i = to_sas_internal(shost->transportt);
 666
 667         if (i->f->phy_release)
 668                 i->f->phy_release(phy);
 669         put_device(dev->parent);
 670         kfree(phy);
 671 }
 672
 673 /**
 674  * sas_phy_alloc  -  allocates and initialize a SAS PHY structure
 675  * @parent:     Parent device
 676  * @number:     Phy index
 677  *
 678  * Allocates an SAS PHY structure.  It will be added in the device tree
 679  * below the device specified by @parent, which has to be either a Scsi_Host
 680  * or sas_rphy.
 681  *
 682  * Returns:
 683  *      SAS PHY allocated or %NULL if the allocation failed.
 684  */
 685 struct sas_phy *sas_phy_alloc(struct device *parent, int number)
 686 {
 687         struct Scsi_Host *shost = dev_to_shost(parent);
 688         struct sas_phy *phy;
 689
 690         phy = kzalloc(sizeof(*phy), GFP_KERNEL);
 691         if (!phy)
 692                 return NULL;
 693
 694         phy->number = number;
 695         phy->enabled = 1;
 696
 697         device_initialize(&phy->dev);
 698         phy->dev.parent = get_device(parent);
 699         phy->dev.release = sas_phy_release;
 700         INIT_LIST_HEAD(&phy->port_siblings);
 701         if (scsi_is_sas_expander_device(parent)) {
 702                 struct sas_rphy *rphy = dev_to_rphy(parent);
 703                 dev_set_name(&phy->dev, "phy-%d:%d:%d", shost->host_no,
 704                         rphy->scsi_target_id, number);
 705         } else
 706                 dev_set_name(&phy->dev, "phy-%d:%d", shost->host_no, number);
 707
 708         transport_setup_device(&phy->dev);
 709
 710         return phy;
 711 }
 712 EXPORT_SYMBOL(sas_phy_alloc);
 713
 714 /**
 715  * sas_phy_add  -  add a SAS PHY to the device hierarchy
 716  * @phy:        The PHY to be added
 717  *
 718  * Publishes a SAS PHY to the rest of the system.
 719  */
 720 int sas_phy_add(struct sas_phy *phy)
 721 {
 722         int error;
 723
 724         error = device_add(&phy->dev);
 725         if (error)
 726                 return error;
 727
 728         error = transport_add_device(&phy->dev);
 729         if (error) {
 730                 device_del(&phy->dev);
 731                 return error;
 732         }
 733         transport_configure_device(&phy->dev);
 734
 735         return 0;
 736 }
 737 EXPORT_SYMBOL(sas_phy_add);
 738
 739 /**
 740  * sas_phy_free  -  free a SAS PHY
 741  * @phy:        SAS PHY to free
 742  *
 743  * Frees the specified SAS PHY.
 744  *
 745  * Note:
 746  *   This function must only be called on a PHY that has not
 747  *   successfully been added using sas_phy_add().
 748  */
 749 void sas_phy_free(struct sas_phy *phy)
 750 {
 751         transport_destroy_device(&phy->dev);
 752         put_device(&phy->dev);
 753 }
 754 EXPORT_SYMBOL(sas_phy_free);
 755
 756 /**
 757  * sas_phy_delete  -  remove SAS PHY
 758  * @phy:        SAS PHY to remove
 759  *
 760  * Removes the specified SAS PHY.  If the SAS PHY has an
 761  * associated remote PHY it is removed before.
 762  */
 763 void
 764 sas_phy_delete(struct sas_phy *phy)
 765 {
 766         struct device *dev = &phy->dev;
 767
 768         /* this happens if the phy is still part of a port when deleted */
 769         BUG_ON(!list_empty(&phy->port_siblings));
 770
 771         transport_remove_device(dev);
 772         device_del(dev);
 773         transport_destroy_device(dev);
 774         put_device(dev);
 775 }
 776 EXPORT_SYMBOL(sas_phy_delete);
 777
 778 /**
 779  * scsi_is_sas_phy  -  check if a struct device represents a SAS PHY
 780  * @dev:        device to check
 781  *
 782  * Returns:
 783  *      %1 if the device represents a SAS PHY, %0 else
 784  */
 785 int scsi_is_sas_phy(const struct device *dev)
 786 {
 787         return dev->release == sas_phy_release;
 788 }
 789 EXPORT_SYMBOL(scsi_is_sas_phy);
 790
 791 /*
 792  * SAS Port attributes
 793  */
 794 #define sas_port_show_simple(field, name, format_string, cast)          \
 795 static ssize_t                                                          \
 796 show_sas_port_##name(struct device *dev,                                \
 797                      struct device_attribute *attr, char *buf)          \
 798 {                                                                       \
 799         struct sas_port *port = transport_class_to_sas_port(dev);       \
 800                                                                         \
 801         return snprintf(buf, 20, format_string, cast port->field);      \
 802 }
 803
 804 #define sas_port_simple_attr(field, name, format_string, type)          \
 805         sas_port_show_simple(field, name, format_string, (type))        \
 806 static DEVICE_ATTR(name, S_IRUGO, show_sas_port_##name, NULL)
 807
 808 sas_port_simple_attr(num_phys, num_phys, "%d\n", int);
 809
 810 static DECLARE_TRANSPORT_CLASS(sas_port_class,
 811                                "sas_port", NULL, NULL, NULL);
 812
 813 static int sas_port_match(struct attribute_container *cont, struct device *dev)
 814 {
 815         struct Scsi_Host *shost;
 816         struct sas_internal *i;
 817
 818         if (!scsi_is_sas_port(dev))
 819                 return 0;
 820         shost = dev_to_shost(dev->parent);
 821
 822         if (!shost->transportt)
 823                 return 0;
 824         if (shost->transportt->host_attrs.ac.class !=
 825                         &sas_host_class.class)
 826                 return 0;
 827
 828         i = to_sas_internal(shost->transportt);
 829         return &i->port_attr_cont.ac == cont;
 830 }
 831
 832
 833 static void sas_port_release(struct device *dev)
 834 {
 835         struct sas_port *port = dev_to_sas_port(dev);
 836
 837         BUG_ON(!list_empty(&port->phy_list));
 838
 839         put_device(dev->parent);
 840         kfree(port);
 841 }
 842
 843 static void sas_port_create_link(struct sas_port *port,
 844                                  struct sas_phy *phy)
 845 {
 846         int res;
 847
 848         res = sysfs_create_link(&port->dev.kobj, &phy->dev.kobj,
 849                                 dev_name(&phy->dev));
 850         if (res)
 851                 goto err;
 852         res = sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
 853         if (res)
 854                 goto err;
 855         return;
 856 err:
 857         printk(KERN_ERR "%s: Cannot create port links, err=%d\n",
 858                __func__, res);
 859 }
 860
 861 static void sas_port_delete_link(struct sas_port *port,
 862                                  struct sas_phy *phy)
 863 {
 864         sysfs_remove_link(&port->dev.kobj, dev_name(&phy->dev));
 865         sysfs_remove_link(&phy->dev.kobj, "port");
 866 }
 867
 868 /** sas_port_alloc - allocate and initialize a SAS port structure
 869  *
 870  * @parent:     parent device
 871  * @port_id:    port number
 872  *
 873  * Allocates a SAS port structure.  It will be added to the device tree
 874  * below the device specified by @parent which must be either a Scsi_Host
 875  * or a sas_expander_device.
 876  *
 877  * Returns %NULL on error
 878  */
 879 struct sas_port *sas_port_alloc(struct device *parent, int port_id)
 880 {
 881         struct Scsi_Host *shost = dev_to_shost(parent);
 882         struct sas_port *port;
 883
 884         port = kzalloc(sizeof(*port), GFP_KERNEL);
 885         if (!port)
 886                 return NULL;
 887
 888         port->port_identifier = port_id;
 889
 890         device_initialize(&port->dev);
 891
 892         port->dev.parent = get_device(parent);
 893         port->dev.release = sas_port_release;
 894
 895         mutex_init(&port->phy_list_mutex);
 896         INIT_LIST_HEAD(&port->phy_list);
 897
 898         if (scsi_is_sas_expander_device(parent)) {
 899                 struct sas_rphy *rphy = dev_to_rphy(parent);
 900                 dev_set_name(&port->dev, "port-%d:%d:%d", shost->host_no,
 901                              rphy->scsi_target_id, port->port_identifier);
 902         } else
 903                 dev_set_name(&port->dev, "port-%d:%d", shost->host_no,
 904                              port->port_identifier);
 905
 906         transport_setup_device(&port->dev);
 907
 908         return port;
 909 }
 910 EXPORT_SYMBOL(sas_port_alloc);
 911
 912 /** sas_port_alloc_num - allocate and initialize a SAS port structure
 913  *
 914  * @parent:     parent device
 915  *
 916  * Allocates a SAS port structure and a number to go with it.  This
 917  * interface is really for adapters where the port number has no
 918  * meansing, so the sas class should manage them.  It will be added to
 919  * the device tree below the device specified by @parent which must be
 920  * either a Scsi_Host or a sas_expander_device.
 921  *
 922  * Returns %NULL on error
 923  */
 924 struct sas_port *sas_port_alloc_num(struct device *parent)
 925 {
 926         int index;
 927         struct Scsi_Host *shost = dev_to_shost(parent);
 928         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
 929
 930         /* FIXME: use idr for this eventually */
 931         mutex_lock(&sas_host->lock);
 932         if (scsi_is_sas_expander_device(parent)) {
 933                 struct sas_rphy *rphy = dev_to_rphy(parent);
 934                 struct sas_expander_device *exp = rphy_to_expander_device(rphy);
 935
 936                 index = exp->next_port_id++;
 937         } else
 938                 index = sas_host->next_port_id++;
 939         mutex_unlock(&sas_host->lock);
 940         return sas_port_alloc(parent, index);
 941 }
 942 EXPORT_SYMBOL(sas_port_alloc_num);
 943
 944 /**
 945  * sas_port_add - add a SAS port to the device hierarchy
 946  * @port:       port to be added
 947  *
 948  * publishes a port to the rest of the system
 949  */
 950 int sas_port_add(struct sas_port *port)
 951 {
 952         int error;
 953
 954         /* No phys should be added until this is made visible */
 955         BUG_ON(!list_empty(&port->phy_list));
 956
 957         error = device_add(&port->dev);
 958
 959         if (error)
 960                 return error;
 961
 962         transport_add_device(&port->dev);
 963         transport_configure_device(&port->dev);
 964
 965         return 0;
 966 }
 967 EXPORT_SYMBOL(sas_port_add);
 968
 969 /**
 970  * sas_port_free  -  free a SAS PORT
 971  * @port:       SAS PORT to free
 972  *
 973  * Frees the specified SAS PORT.
 974  *
 975  * Note:
 976  *   This function must only be called on a PORT that has not
 977  *   successfully been added using sas_port_add().
 978  */
 979 void sas_port_free(struct sas_port *port)
 980 {
 981         transport_destroy_device(&port->dev);
 982         put_device(&port->dev);
 983 }
 984 EXPORT_SYMBOL(sas_port_free);
 985
 986 /**
 987  * sas_port_delete  -  remove SAS PORT
 988  * @port:       SAS PORT to remove
 989  *
 990  * Removes the specified SAS PORT.  If the SAS PORT has an
 991  * associated phys, unlink them from the port as well.
 992  */
 993 void sas_port_delete(struct sas_port *port)
 994 {
 995         struct device *dev = &port->dev;
 996         struct sas_phy *phy, *tmp_phy;
 997
 998         if (port->rphy) {
 999                 sas_rphy_delete(port->rphy);
1000                 port->rphy = NULL;
1001         }
1002
1003         mutex_lock(&port->phy_list_mutex);
1004         list_for_each_entry_safe(phy, tmp_phy, &port->phy_list,
1005                                  port_siblings) {
1006                 sas_port_delete_link(port, phy);
1007                 list_del_init(&phy->port_siblings);
1008         }
1009         mutex_unlock(&port->phy_list_mutex);
1010
1011         if (port->is_backlink) {
1012                 struct device *parent = port->dev.parent;
1013
1014                 sysfs_remove_link(&port->dev.kobj, dev_name(parent));
1015                 port->is_backlink = 0;
1016         }
1017
1018         transport_remove_device(dev);
1019         device_del(dev);
1020         transport_destroy_device(dev);
1021         put_device(dev);
1022 }
1023 EXPORT_SYMBOL(sas_port_delete);
1024
1025 /**
1026  * scsi_is_sas_port -  check if a struct device represents a SAS port
1027  * @dev:        device to check
1028  *
1029  * Returns:
1030  *      %1 if the device represents a SAS Port, %0 else
1031  */
1032 int scsi_is_sas_port(const struct device *dev)
1033 {
1034         return dev->release == sas_port_release;
1035 }
1036 EXPORT_SYMBOL(scsi_is_sas_port);
1037
1038 /**
1039  * sas_port_get_phy - try to take a reference on a port member
1040  * @port: port to check
1041  */
1042 struct sas_phy *sas_port_get_phy(struct sas_port *port)
1043 {
1044         struct sas_phy *phy;
1045
1046         mutex_lock(&port->phy_list_mutex);
1047         if (list_empty(&port->phy_list))
1048                 phy = NULL;
1049         else {
1050                 struct list_head *ent = port->phy_list.next;
1051
1052                 phy = list_entry(ent, typeof(*phy), port_siblings);
1053                 get_device(&phy->dev);
1054         }
1055         mutex_unlock(&port->phy_list_mutex);
1056
1057         return phy;
1058 }
1059 EXPORT_SYMBOL(sas_port_get_phy);
1060
1061 /**
1062  * sas_port_add_phy - add another phy to a port to form a wide port
1063  * @port:       port to add the phy to
1064  * @phy:        phy to add
1065  *
1066  * When a port is initially created, it is empty (has no phys).  All
1067  * ports must have at least one phy to operated, and all wide ports
1068  * must have at least two.  The current code makes no difference
1069  * between ports and wide ports, but the only object that can be
1070  * connected to a remote device is a port, so ports must be formed on
1071  * all devices with phys if they're connected to anything.
1072  */
1073 void sas_port_add_phy(struct sas_port *port, struct sas_phy *phy)
1074 {
1075         mutex_lock(&port->phy_list_mutex);
1076         if (unlikely(!list_empty(&phy->port_siblings))) {
1077                 /* make sure we're already on this port */
1078                 struct sas_phy *tmp;
1079
1080                 list_for_each_entry(tmp, &port->phy_list, port_siblings)
1081                         if (tmp == phy)
1082                                 break;
1083                 /* If this trips, you added a phy that was already
1084                  * part of a different port */
1085                 if (unlikely(tmp != phy)) {
1086                         dev_printk(KERN_ERR, &port->dev, "trying to add phy %s fails: it's already part of another port\n",
1087                                    dev_name(&phy->dev));
1088                         BUG();
1089                 }
1090         } else {
1091                 sas_port_create_link(port, phy);
1092                 list_add_tail(&phy->port_siblings, &port->phy_list);
1093                 port->num_phys++;
1094         }
1095         mutex_unlock(&port->phy_list_mutex);
1096 }
1097 EXPORT_SYMBOL(sas_port_add_phy);
1098
1099 /**
1100  * sas_port_delete_phy - remove a phy from a port or wide port
1101  * @port:       port to remove the phy from
1102  * @phy:        phy to remove
1103  *
1104  * This operation is used for tearing down ports again.  It must be
1105  * done to every port or wide port before calling sas_port_delete.
1106  */
1107 void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy)
1108 {
1109         mutex_lock(&port->phy_list_mutex);
1110         sas_port_delete_link(port, phy);
1111         list_del_init(&phy->port_siblings);
1112         port->num_phys--;
1113         mutex_unlock(&port->phy_list_mutex);
1114 }
1115 EXPORT_SYMBOL(sas_port_delete_phy);
1116
1117 void sas_port_mark_backlink(struct sas_port *port)
1118 {
1119         int res;
1120         struct device *parent = port->dev.parent->parent->parent;
1121
1122         if (port->is_backlink)
1123                 return;
1124         port->is_backlink = 1;
1125         res = sysfs_create_link(&port->dev.kobj, &parent->kobj,
1126                                 dev_name(parent));
1127         if (res)
1128                 goto err;
1129         return;
1130 err:
1131         printk(KERN_ERR "%s: Cannot create port backlink, err=%d\n",
1132                __func__, res);
1133
1134 }
1135 EXPORT_SYMBOL(sas_port_mark_backlink);
1136
1137 /*
1138  * SAS remote PHY attributes.
1139  */
1140
1141 #define sas_rphy_show_simple(field, name, format_string, cast)          \
1142 static ssize_t                                                          \
1143 show_sas_rphy_##name(struct device *dev,                                \
1144                      struct device_attribute *attr, char *buf)          \
1145 {                                                                       \
1146         struct sas_rphy *rphy = transport_class_to_rphy(dev);           \
1147                                                                         \
1148         return snprintf(buf, 20, format_string, cast rphy->field);      \
1149 }
1150
1151 #define sas_rphy_simple_attr(field, name, format_string, type)          \
1152         sas_rphy_show_simple(field, name, format_string, (type))        \
1153 static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,                     \
1154                 show_sas_rphy_##name, NULL)
1155
1156 #define sas_rphy_show_protocol(field, name)                             \
1157 static ssize_t                                                          \
1158 show_sas_rphy_##name(struct device *dev,                                \
1159                      struct device_attribute *attr, char *buf)          \
1160 {                                                                       \
1161         struct sas_rphy *rphy = transport_class_to_rphy(dev);           \
1162                                                                         \
1163         if (!rphy->field)                                       \
1164                 return snprintf(buf, 20, "none\n");                     \
1165         return get_sas_protocol_names(rphy->field, buf);        \
1166 }
1167
1168 #define sas_rphy_protocol_attr(field, name)                             \
1169         sas_rphy_show_protocol(field, name)                             \
1170 static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,                     \
1171                 show_sas_rphy_##name, NULL)
1172
1173 static ssize_t
1174 show_sas_rphy_device_type(struct device *dev,
1175                           struct device_attribute *attr, char *buf)
1176 {
1177         struct sas_rphy *rphy = transport_class_to_rphy(dev);
1178
1179         if (!rphy->identify.device_type)
1180                 return snprintf(buf, 20, "none\n");
1181         return get_sas_device_type_names(
1182                         rphy->identify.device_type, buf);
1183 }
1184
1185 static SAS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
1186                 show_sas_rphy_device_type, NULL);
1187
1188 static ssize_t
1189 show_sas_rphy_enclosure_identifier(struct device *dev,
1190                                    struct device_attribute *attr, char *buf)
1191 {
1192         struct sas_rphy *rphy = transport_class_to_rphy(dev);
1193         struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1194         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1195         struct sas_internal *i = to_sas_internal(shost->transportt);
1196         u64 identifier;
1197         int error;
1198
1199         error = i->f->get_enclosure_identifier(rphy, &identifier);
1200         if (error)
1201                 return error;
1202         return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
1203 }
1204
1205 static SAS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
1206                 show_sas_rphy_enclosure_identifier, NULL);
1207
1208 static ssize_t
1209 show_sas_rphy_bay_identifier(struct device *dev,
1210                              struct device_attribute *attr, char *buf)
1211 {
1212         struct sas_rphy *rphy = transport_class_to_rphy(dev);
1213         struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1214         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1215         struct sas_internal *i = to_sas_internal(shost->transportt);
1216         int val;
1217
1218         val = i->f->get_bay_identifier(rphy);
1219         if (val < 0)
1220                 return val;
1221         return sprintf(buf, "%d\n", val);
1222 }
1223
1224 static SAS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
1225                 show_sas_rphy_bay_identifier, NULL);
1226
1227 sas_rphy_protocol_attr(identify.initiator_port_protocols,
1228                 initiator_port_protocols);
1229 sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
1230 sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
1231                 unsigned long long);
1232 sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
1233 sas_rphy_simple_attr(scsi_target_id, scsi_target_id, "%d\n", u32);
1234
1235 /* only need 8 bytes of data plus header (4 or 8) */
1236 #define BUF_SIZE 64
1237
1238 int sas_read_port_mode_page(struct scsi_device *sdev)
1239 {
1240         char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
1241         struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
1242         struct scsi_mode_data mode_data;
1243         int error;
1244
1245         if (!buffer)
1246                 return -ENOMEM;
1247
1248         error = scsi_mode_sense(sdev, 1, 0x19, 0, buffer, BUF_SIZE, 30*HZ, 3,
1249                                 &mode_data, NULL);
1250
1251         if (error)
1252                 goto out;
1253
1254         msdata = buffer +  mode_data.header_length +
1255                 mode_data.block_descriptor_length;
1256
1257         if (msdata - buffer > BUF_SIZE - 8)
1258                 goto out;
1259
1260         error = 0;
1261
1262         rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
1263         rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
1264         rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
1265
1266  out:
1267         kfree(buffer);
1268         return error;
1269 }
1270 EXPORT_SYMBOL(sas_read_port_mode_page);
1271
1272 static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
1273                                "sas_end_device", NULL, NULL, NULL);
1274
1275 #define sas_end_dev_show_simple(field, name, format_string, cast)       \
1276 static ssize_t                                                          \
1277 show_sas_end_dev_##name(struct device *dev,                             \
1278                         struct device_attribute *attr, char *buf)       \
1279 {                                                                       \
1280         struct sas_rphy *rphy = transport_class_to_rphy(dev);           \
1281         struct sas_end_device *rdev = rphy_to_end_device(rphy);         \
1282                                                                         \
1283         return snprintf(buf, 20, format_string, cast rdev->field);      \
1284 }
1285
1286 #define sas_end_dev_simple_attr(field, name, format_string, type)       \
1287         sas_end_dev_show_simple(field, name, format_string, (type))     \
1288 static SAS_DEVICE_ATTR(end_dev, name, S_IRUGO,                  \
1289                 show_sas_end_dev_##name, NULL)
1290
1291 sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
1292 sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
1293                         "%d\n", int);
1294 sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
1295                         "%d\n", int);
1296 sas_end_dev_simple_attr(tlr_supported, tlr_supported,
1297                         "%d\n", int);
1298 sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
1299                         "%d\n", int);
1300
1301 static DECLARE_TRANSPORT_CLASS(sas_expander_class,
1302                                "sas_expander", NULL, NULL, NULL);
1303
1304 #define sas_expander_show_simple(field, name, format_string, cast)      \
1305 static ssize_t                                                          \
1306 show_sas_expander_##name(struct device *dev,                            \
1307                          struct device_attribute *attr, char *buf)      \
1308 {                                                                       \
1309         struct sas_rphy *rphy = transport_class_to_rphy(dev);           \
1310         struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
1311                                                                         \
1312         return snprintf(buf, 20, format_string, cast edev->field);      \
1313 }
1314
1315 #define sas_expander_simple_attr(field, name, format_string, type)      \
1316         sas_expander_show_simple(field, name, format_string, (type))    \
1317 static SAS_DEVICE_ATTR(expander, name, S_IRUGO,                         \
1318                 show_sas_expander_##name, NULL)
1319
1320 sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
1321 sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
1322 sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
1323 sas_expander_simple_attr(component_vendor_id, component_vendor_id,
1324                          "%s\n", char *);
1325 sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
1326 sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
1327                          unsigned int);
1328 sas_expander_simple_attr(level, level, "%d\n", int);
1329
1330 static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
1331                 "sas_device", NULL, NULL, NULL);
1332
1333 static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
1334 {
1335         struct Scsi_Host *shost;
1336         struct sas_internal *i;
1337
1338         if (!scsi_is_sas_rphy(dev))
1339                 return 0;
1340         shost = dev_to_shost(dev->parent->parent);
1341
1342         if (!shost->transportt)
1343                 return 0;
1344         if (shost->transportt->host_attrs.ac.class !=
1345                         &sas_host_class.class)
1346                 return 0;
1347
1348         i = to_sas_internal(shost->transportt);
1349         return &i->rphy_attr_cont.ac == cont;
1350 }
1351
1352 static int sas_end_dev_match(struct attribute_container *cont,
1353                              struct device *dev)
1354 {
1355         struct Scsi_Host *shost;
1356         struct sas_internal *i;
1357         struct sas_rphy *rphy;
1358
1359         if (!scsi_is_sas_rphy(dev))
1360                 return 0;
1361         shost = dev_to_shost(dev->parent->parent);
1362         rphy = dev_to_rphy(dev);
1363
1364         if (!shost->transportt)
1365                 return 0;
1366         if (shost->transportt->host_attrs.ac.class !=
1367                         &sas_host_class.class)
1368                 return 0;
1369
1370         i = to_sas_internal(shost->transportt);
1371         return &i->end_dev_attr_cont.ac == cont &&
1372                 rphy->identify.device_type == SAS_END_DEVICE;
1373 }
1374
1375 static int sas_expander_match(struct attribute_container *cont,
1376                               struct device *dev)
1377 {
1378         struct Scsi_Host *shost;
1379         struct sas_internal *i;
1380         struct sas_rphy *rphy;
1381
1382         if (!scsi_is_sas_rphy(dev))
1383                 return 0;
1384         shost = dev_to_shost(dev->parent->parent);
1385         rphy = dev_to_rphy(dev);
1386
1387         if (!shost->transportt)
1388                 return 0;
1389         if (shost->transportt->host_attrs.ac.class !=
1390                         &sas_host_class.class)
1391                 return 0;
1392
1393         i = to_sas_internal(shost->transportt);
1394         return &i->expander_attr_cont.ac == cont &&
1395                 (rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
1396                  rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
1397 }
1398
1399 static void sas_expander_release(struct device *dev)
1400 {
1401         struct sas_rphy *rphy = dev_to_rphy(dev);
1402         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
1403
1404         put_device(dev->parent);
1405         kfree(edev);
1406 }
1407
1408 static void sas_end_device_release(struct device *dev)
1409 {
1410         struct sas_rphy *rphy = dev_to_rphy(dev);
1411         struct sas_end_device *edev = rphy_to_end_device(rphy);
1412
1413         put_device(dev->parent);
1414         kfree(edev);
1415 }
1416
1417 /**
1418  * sas_rphy_initialize - common rphy initialization
1419  * @rphy:       rphy to initialise
1420  *
1421  * Used by both sas_end_device_alloc() and sas_expander_alloc() to
1422  * initialise the common rphy component of each.
1423  */
1424 static void sas_rphy_initialize(struct sas_rphy *rphy)
1425 {
1426         INIT_LIST_HEAD(&rphy->list);
1427 }
1428
1429 /**
1430  * sas_end_device_alloc - allocate an rphy for an end device
1431  * @parent: which port
1432  *
1433  * Allocates an SAS remote PHY structure, connected to @parent.
1434  *
1435  * Returns:
1436  *      SAS PHY allocated or %NULL if the allocation failed.
1437  */
1438 struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
1439 {
1440         struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1441         struct sas_end_device *rdev;
1442
1443         rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1444         if (!rdev) {
1445                 return NULL;
1446         }
1447
1448         device_initialize(&rdev->rphy.dev);
1449         rdev->rphy.dev.parent = get_device(&parent->dev);
1450         rdev->rphy.dev.release = sas_end_device_release;
1451         if (scsi_is_sas_expander_device(parent->dev.parent)) {
1452                 struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
1453                 dev_set_name(&rdev->rphy.dev, "end_device-%d:%d:%d",
1454                              shost->host_no, rphy->scsi_target_id,
1455                              parent->port_identifier);
1456         } else
1457                 dev_set_name(&rdev->rphy.dev, "end_device-%d:%d",
1458                              shost->host_no, parent->port_identifier);
1459         rdev->rphy.identify.device_type = SAS_END_DEVICE;
1460         sas_rphy_initialize(&rdev->rphy);
1461         transport_setup_device(&rdev->rphy.dev);
1462
1463         return &rdev->rphy;
1464 }
1465 EXPORT_SYMBOL(sas_end_device_alloc);
1466
1467 /**
1468  * sas_expander_alloc - allocate an rphy for an end device
1469  * @parent: which port
1470  * @type: SAS_EDGE_EXPANDER_DEVICE or SAS_FANOUT_EXPANDER_DEVICE
1471  *
1472  * Allocates an SAS remote PHY structure, connected to @parent.
1473  *
1474  * Returns:
1475  *      SAS PHY allocated or %NULL if the allocation failed.
1476  */
1477 struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
1478                                     enum sas_device_type type)
1479 {
1480         struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1481         struct sas_expander_device *rdev;
1482         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1483
1484         BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
1485                type != SAS_FANOUT_EXPANDER_DEVICE);
1486
1487         rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1488         if (!rdev) {
1489                 return NULL;
1490         }
1491
1492         device_initialize(&rdev->rphy.dev);
1493         rdev->rphy.dev.parent = get_device(&parent->dev);
1494         rdev->rphy.dev.release = sas_expander_release;
1495         mutex_lock(&sas_host->lock);
1496         rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
1497         mutex_unlock(&sas_host->lock);
1498         dev_set_name(&rdev->rphy.dev, "expander-%d:%d",
1499                      shost->host_no, rdev->rphy.scsi_target_id);
1500         rdev->rphy.identify.device_type = type;
1501         sas_rphy_initialize(&rdev->rphy);
1502         transport_setup_device(&rdev->rphy.dev);
1503
1504         return &rdev->rphy;
1505 }
1506 EXPORT_SYMBOL(sas_expander_alloc);
1507
1508 /**
1509  * sas_rphy_add  -  add a SAS remote PHY to the device hierarchy
1510  * @rphy:       The remote PHY to be added
1511  *
1512  * Publishes a SAS remote PHY to the rest of the system.
1513  */
1514 int sas_rphy_add(struct sas_rphy *rphy)
1515 {
1516         struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1517         struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
1518         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1519         struct sas_identify *identify = &rphy->identify;
1520         int error;
1521
1522         if (parent->rphy)
1523                 return -ENXIO;
1524         parent->rphy = rphy;
1525
1526         error = device_add(&rphy->dev);
1527         if (error)
1528                 return error;
1529         transport_add_device(&rphy->dev);
1530         transport_configure_device(&rphy->dev);
1531         if (sas_bsg_initialize(shost, rphy))
1532                 printk("fail to a bsg device %s\n", dev_name(&rphy->dev));
1533
1534
1535         mutex_lock(&sas_host->lock);
1536         list_add_tail(&rphy->list, &sas_host->rphy_list);
1537         if (identify->device_type == SAS_END_DEVICE &&
1538             (identify->target_port_protocols &
1539              (SAS_PROTOCOL_SSP | SAS_PROTOCOL_STP | SAS_PROTOCOL_SATA)))
1540                 rphy->scsi_target_id = sas_host->next_target_id++;
1541         else if (identify->device_type == SAS_END_DEVICE)
1542                 rphy->scsi_target_id = -1;
1543         mutex_unlock(&sas_host->lock);
1544
1545         if (identify->device_type == SAS_END_DEVICE &&
1546             rphy->scsi_target_id != -1) {
1547                 int lun;
1548
1549                 if (identify->target_port_protocols & SAS_PROTOCOL_SSP)
1550                         lun = SCAN_WILD_CARD;
1551                 else
1552                         lun = 0;
1553
1554                 scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun,
1555                                  SCSI_SCAN_INITIAL);
1556         }
1557
1558         return 0;
1559 }
1560 EXPORT_SYMBOL(sas_rphy_add);
1561
1562 /**
1563  * sas_rphy_free  -  free a SAS remote PHY
1564  * @rphy: SAS remote PHY to free
1565  *
1566  * Frees the specified SAS remote PHY.
1567  *
1568  * Note:
1569  *   This function must only be called on a remote
1570  *   PHY that has not successfully been added using
1571  *   sas_rphy_add() (or has been sas_rphy_remove()'d)
1572  */
1573 void sas_rphy_free(struct sas_rphy *rphy)
1574 {
1575         struct device *dev = &rphy->dev;
1576         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
1577         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1578
1579         mutex_lock(&sas_host->lock);
1580         list_del(&rphy->list);
1581         mutex_unlock(&sas_host->lock);
1582
1583         transport_destroy_device(dev);
1584
1585         put_device(dev);
1586 }
1587 EXPORT_SYMBOL(sas_rphy_free);
1588
1589 /**
1590  * sas_rphy_delete  -  remove and free SAS remote PHY
1591  * @rphy:       SAS remote PHY to remove and free
1592  *
1593  * Removes the specified SAS remote PHY and frees it.
1594  */
1595 void
1596 sas_rphy_delete(struct sas_rphy *rphy)
1597 {
1598         sas_rphy_remove(rphy);
1599         sas_rphy_free(rphy);
1600 }
1601 EXPORT_SYMBOL(sas_rphy_delete);
1602
1603 /**
1604  * sas_rphy_unlink  -  unlink SAS remote PHY
1605  * @rphy:       SAS remote phy to unlink from its parent port
1606  *
1607  * Removes port reference to an rphy
1608  */
1609 void sas_rphy_unlink(struct sas_rphy *rphy)
1610 {
1611         struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1612
1613         parent->rphy = NULL;
1614 }
1615 EXPORT_SYMBOL(sas_rphy_unlink);
1616
1617 /**
1618  * sas_rphy_remove  -  remove SAS remote PHY
1619  * @rphy:       SAS remote phy to remove
1620  *
1621  * Removes the specified SAS remote PHY.
1622  */
1623 void
1624 sas_rphy_remove(struct sas_rphy *rphy)
1625 {
1626         struct device *dev = &rphy->dev;
1627
1628         switch (rphy->identify.device_type) {
1629         case SAS_END_DEVICE:
1630                 scsi_remove_target(dev);
1631                 break;
1632         case SAS_EDGE_EXPANDER_DEVICE:
1633         case SAS_FANOUT_EXPANDER_DEVICE:
1634                 sas_remove_children(dev);
1635                 break;
1636         default:
1637                 break;
1638         }
1639
1640         sas_rphy_unlink(rphy);
1641         bsg_remove_queue(rphy->q);
1642         transport_remove_device(dev);
1643         device_del(dev);
1644 }
1645 EXPORT_SYMBOL(sas_rphy_remove);
1646
1647 /**
1648  * scsi_is_sas_rphy  -  check if a struct device represents a SAS remote PHY
1649  * @dev:        device to check
1650  *
1651  * Returns:
1652  *      %1 if the device represents a SAS remote PHY, %0 else
1653  */
1654 int scsi_is_sas_rphy(const struct device *dev)
1655 {
1656         return dev->release == sas_end_device_release ||
1657                 dev->release == sas_expander_release;
1658 }
1659 EXPORT_SYMBOL(scsi_is_sas_rphy);
1660
1661
1662 /*
1663  * SCSI scan helper
1664  */
1665
1666 static int sas_user_scan(struct Scsi_Host *shost, uint channel,
1667                 uint id, u64 lun)
1668 {
1669         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1670         struct sas_rphy *rphy;
1671
1672         mutex_lock(&sas_host->lock);
1673         list_for_each_entry(rphy, &sas_host->rphy_list, list) {
1674                 if (rphy->identify.device_type != SAS_END_DEVICE ||
1675                     rphy->scsi_target_id == -1)
1676                         continue;
1677
1678                 if ((channel == SCAN_WILD_CARD || channel == 0) &&
1679                     (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
1680                         scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id,
1681                                          lun, SCSI_SCAN_MANUAL);
1682                 }
1683         }
1684         mutex_unlock(&sas_host->lock);
1685
1686         return 0;
1687 }
1688
1689
1690 /*
1691  * Setup / Teardown code
1692  */
1693
1694 #define SETUP_TEMPLATE(attrb, field, perm, test)                        \
1695         i->private_##attrb[count] = dev_attr_##field;           \
1696         i->private_##attrb[count].attr.mode = perm;                     \
1697         i->attrb[count] = &i->private_##attrb[count];                   \
1698         if (test)                                                       \
1699                 count++
1700
1701 #define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm)   \
1702         i->private_##attrb[count] = dev_attr_##field;           \
1703         i->private_##attrb[count].attr.mode = perm;                     \
1704         if (ro_test) {                                                  \
1705                 i->private_##attrb[count].attr.mode = ro_perm;          \
1706                 i->private_##attrb[count].store = NULL;                 \
1707         }                                                               \
1708         i->attrb[count] = &i->private_##attrb[count];                   \
1709         if (test)                                                       \
1710                 count++
1711
1712 #define SETUP_RPORT_ATTRIBUTE(field)                                    \
1713         SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
1714
1715 #define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func)                     \
1716         SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
1717
1718 #define SETUP_PHY_ATTRIBUTE(field)                                      \
1719         SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
1720
1721 #define SETUP_PHY_ATTRIBUTE_RW(field)                                   \
1722         SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,       \
1723                         !i->f->set_phy_speed, S_IRUGO)
1724
1725 #define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func)                    \
1726         SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,       \
1727                           !i->f->func, S_IRUGO)
1728
1729 #define SETUP_PORT_ATTRIBUTE(field)                                     \
1730         SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
1731
1732 #define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func)                       \
1733         SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
1734
1735 #define SETUP_PHY_ATTRIBUTE_WRONLY(field)                               \
1736         SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
1737
1738 #define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func)                \
1739         SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
1740
1741 #define SETUP_END_DEV_ATTRIBUTE(field)                                  \
1742         SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
1743
1744 #define SETUP_EXPANDER_ATTRIBUTE(field)                                 \
1745         SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
1746
1747 /**
1748  * sas_attach_transport  -  instantiate SAS transport template
1749  * @ft:         SAS transport class function template
1750  */
1751 struct scsi_transport_template *
1752 sas_attach_transport(struct sas_function_template *ft)
1753 {
1754         struct sas_internal *i;
1755         int count;
1756
1757         i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
1758         if (!i)
1759                 return NULL;
1760
1761         i->t.user_scan = sas_user_scan;
1762
1763         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1764         i->t.host_attrs.ac.class = &sas_host_class.class;
1765         i->t.host_attrs.ac.match = sas_host_match;
1766         transport_container_register(&i->t.host_attrs);
1767         i->t.host_size = sizeof(struct sas_host_attrs);
1768
1769         i->phy_attr_cont.ac.class = &sas_phy_class.class;
1770         i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
1771         i->phy_attr_cont.ac.match = sas_phy_match;
1772         transport_container_register(&i->phy_attr_cont);
1773
1774         i->port_attr_cont.ac.class = &sas_port_class.class;
1775         i->port_attr_cont.ac.attrs = &i->port_attrs[0];
1776         i->port_attr_cont.ac.match = sas_port_match;
1777         transport_container_register(&i->port_attr_cont);
1778
1779         i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
1780         i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
1781         i->rphy_attr_cont.ac.match = sas_rphy_match;
1782         transport_container_register(&i->rphy_attr_cont);
1783
1784         i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
1785         i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
1786         i->end_dev_attr_cont.ac.match = sas_end_dev_match;
1787         transport_container_register(&i->end_dev_attr_cont);
1788
1789         i->expander_attr_cont.ac.class = &sas_expander_class.class;
1790         i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
1791         i->expander_attr_cont.ac.match = sas_expander_match;
1792         transport_container_register(&i->expander_attr_cont);
1793
1794         i->f = ft;
1795
1796         count = 0;
1797         SETUP_PHY_ATTRIBUTE(initiator_port_protocols);
1798         SETUP_PHY_ATTRIBUTE(target_port_protocols);
1799         SETUP_PHY_ATTRIBUTE(device_type);
1800         SETUP_PHY_ATTRIBUTE(sas_address);
1801         SETUP_PHY_ATTRIBUTE(phy_identifier);
1802         SETUP_PHY_ATTRIBUTE(negotiated_linkrate);
1803         SETUP_PHY_ATTRIBUTE(minimum_linkrate_hw);
1804         SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
1805         SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
1806         SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
1807
1808         SETUP_PHY_ATTRIBUTE(invalid_dword_count);
1809         SETUP_PHY_ATTRIBUTE(running_disparity_error_count);
1810         SETUP_PHY_ATTRIBUTE(loss_of_dword_sync_count);
1811         SETUP_PHY_ATTRIBUTE(phy_reset_problem_count);
1812         SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(link_reset, phy_reset);
1813         SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
1814         SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
1815         i->phy_attrs[count] = NULL;
1816
1817         count = 0;
1818         SETUP_PORT_ATTRIBUTE(num_phys);
1819         i->port_attrs[count] = NULL;
1820
1821         count = 0;
1822         SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
1823         SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
1824         SETUP_RPORT_ATTRIBUTE(rphy_device_type);
1825         SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
1826         SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
1827         SETUP_RPORT_ATTRIBUTE(rphy_scsi_target_id);
1828         SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
1829                                        get_enclosure_identifier);
1830         SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
1831                                        get_bay_identifier);
1832         i->rphy_attrs[count] = NULL;
1833
1834         count = 0;
1835         SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
1836         SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
1837         SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
1838         SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
1839         SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
1840         i->end_dev_attrs[count] = NULL;
1841
1842         count = 0;
1843         SETUP_EXPANDER_ATTRIBUTE(vendor_id);
1844         SETUP_EXPANDER_ATTRIBUTE(product_id);
1845         SETUP_EXPANDER_ATTRIBUTE(product_rev);
1846         SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
1847         SETUP_EXPANDER_ATTRIBUTE(component_id);
1848         SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
1849         SETUP_EXPANDER_ATTRIBUTE(level);
1850         i->expander_attrs[count] = NULL;
1851
1852         return &i->t;
1853 }
1854 EXPORT_SYMBOL(sas_attach_transport);
1855
1856 /**
1857  * sas_release_transport  -  release SAS transport template instance
1858  * @t:          transport template instance
1859  */
1860 void sas_release_transport(struct scsi_transport_template *t)
1861 {
1862         struct sas_internal *i = to_sas_internal(t);
1863
1864         transport_container_unregister(&i->t.host_attrs);
1865         transport_container_unregister(&i->phy_attr_cont);
1866         transport_container_unregister(&i->port_attr_cont);
1867         transport_container_unregister(&i->rphy_attr_cont);
1868         transport_container_unregister(&i->end_dev_attr_cont);
1869         transport_container_unregister(&i->expander_attr_cont);
1870
1871         kfree(i);
1872 }
1873 EXPORT_SYMBOL(sas_release_transport);
1874
1875 static __init int sas_transport_init(void)
1876 {
1877         int error;
1878
1879         error = transport_class_register(&sas_host_class);
1880         if (error)
1881                 goto out;
1882         error = transport_class_register(&sas_phy_class);
1883         if (error)
1884                 goto out_unregister_transport;
1885         error = transport_class_register(&sas_port_class);
1886         if (error)
1887                 goto out_unregister_phy;
1888         error = transport_class_register(&sas_rphy_class);
1889         if (error)
1890                 goto out_unregister_port;
1891         error = transport_class_register(&sas_end_dev_class);
1892         if (error)
1893                 goto out_unregister_rphy;
1894         error = transport_class_register(&sas_expander_class);
1895         if (error)
1896                 goto out_unregister_end_dev;
1897
1898         return 0;
1899
1900  out_unregister_end_dev:
1901         transport_class_unregister(&sas_end_dev_class);
1902  out_unregister_rphy:
1903         transport_class_unregister(&sas_rphy_class);
1904  out_unregister_port:
1905         transport_class_unregister(&sas_port_class);
1906  out_unregister_phy:
1907         transport_class_unregister(&sas_phy_class);
1908  out_unregister_transport:
1909         transport_class_unregister(&sas_host_class);
1910  out:
1911         return error;
1912
1913 }
1914
1915 static void __exit sas_transport_exit(void)
1916 {
1917         transport_class_unregister(&sas_host_class);
1918         transport_class_unregister(&sas_phy_class);
1919         transport_class_unregister(&sas_port_class);
1920         transport_class_unregister(&sas_rphy_class);
1921         transport_class_unregister(&sas_end_dev_class);
1922         transport_class_unregister(&sas_expander_class);
1923 }
1924
1925 MODULE_AUTHOR("Christoph Hellwig");
1926 MODULE_DESCRIPTION("SAS Transport Attributes");
1927 MODULE_LICENSE("GPL");
1928
1929 module_init(sas_transport_init);
1930 module_exit(sas_transport_exit);